Ed Miliband has pledged to work for a two-state solution in the Middle East if he becomes Prime Minister.
Speaking at the Labour Party conference in Manchester, Mr Miliband attributed a short part of his 80-minute speech to the issue of Israel and the Palestinians.
He said: "I'm determined that as Prime Minister I promote our values all round the world and one of the things that that means, friends, is seeking a solution to a problem that we know in our hearts is one of the biggest problems our world faces, and that issue is in the Middle East and Israel and Palestine.
"I tell you, I will fight with every fibre of my being to get the two-state solution, two states for two people, Israel and a Palestinian state living side by side. That will be a very, very important task of the next Labour government."
Mr Miliband opened his speech by calling for a United Nations resolution to tackle Islamic State terrorists.
"We support the overnight action against Isil," he said. "What needs to happen now is that the UN needs to play its part - a UN Security Council resolution to win the international support to counter that threat of Isil."
He also emphasised his personal commitment to fight for fairness for ordinary people.
Mr Miliband explained that that impulse had driven him to take on the Daily Mail over its article which suggested his father Ralph, a Jewish refugee from the Nazis, had been disloyal to his adopted country.
“It’s why I stood up to the Daily Mail when they said my dad hated Britain, because I know my dad loved Britain."
In reference to last week's Scottish independence vote, Mr Milband insisted the UK was better together, but that there was room to be proud of being English, Scottish, Welsh or Irish.
As an example of English solidarity he cited the Battle of Cable Street, when Jews joined other groups in the fight against far-right extremist Oswald Mosely and his Blackshirts in 1936.
In a wide-ranging speech, the Labour leader “outlined six national goals” to transform Britain over the next 10 years.
They include £2.5 billion worth of investment in the NHS, building half a million new homes and helping young people by creating as many apprenticeships as university places.
Labour was the party of “hard work, paid fairly”, while the Tories favoured the wealthy and privileged, he said, promising that a Labour government would raise the minimum wage to give low-paid workers up to an extra £3,000 a year.
